MS Word monospace font is not monospace for spaces

I want to create a report including c++ source codes with MS Word (macOS version).

Though I use monospaced fonts, white spaces are not monospaced. White spaces have different width with letters.

How to write C++ source codes with space indentation.

Spaces have different width with letters in some monospaced fonts

The right font MS Mincho is the right layout but I don't like the font.

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